SIO8 Datasheet, PDF (1/8 Pages) ABCircuits – Stand Alone UART IC 8 bits of input and 8 bits of output

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SIO8 IC
Stand Alone UART IC
8 bits of input and 8 bits of output
General Description
The SIO8 IC is a stand alone UART designed to provide 8 bits of input and output data to connect
to RS-232, USB, RS-485, Ethernet or directly to your UART. Outputs can be used to drive relays,
logic, optocouplers or a transistors. Inputs can be from switches, relay contacts, logic,
optocouplers or a transistor switched to ground. The SIO8 has internal pull resistors on most
inputs to minimize additional parts. If the MODE pin is open or high, the data on the IA0-7 pins
are transmitted only after a byte is received on the SIN- pin. If the MODE pin is low, the SIO8 IC
transmits data anytime the inputs change or every of 100 mS, or 1000 mS, depending on the
state of the SPD pin. A positive pulse is generated on the RXP pin every time a byte is received
on the SIN- pin. The serial format to the SIO8 is standard asynchronous format, using 8 bits, 1
stop and no parity at 9600 BPS. Other formats and encoding are available, contact the factory.
A .1 uF bypass capacitor is suggested across the VDD and VSS pins. The part uses the standard
28 pin .3 inch width SOIC package.
Features
• Asynchronous serial control for 8
bits of input and 8 bits of output.
• Can connect with RS-232, RS -485,
USB or Ethernet or UART.
• Inputs can be switches, relay
contacts, optocouplers, and logic.
• On chip input pull up resistors on
most inputs.
• Outputs can be used to drive relays,
transistors, optocouplers, and logic.
• No external parts required.
• Low power consumption 5 mA
typical.
• Supply voltage 2.4 to 5.25 volts.
• All timing internally generated.
• TTL and CMOS compatible outputs.
• Part is in full production.
• SOIC and DIP 28 Pin Package.
• ROHS Compliant
• Low EMI
Applications
• Input Output Expansion
• Remote control
• Process control
• Building Automation
• Off site monitoring
• Security systems
• Internet of things
• Machine control
Part Number 74C922-SO
Copyright © 2014 ABCircuits. Revised September 2014 Page 1 of 8